First of all, thanks for creating this. Such a good idea to enable safe usage of switch, while also being much better explainable to colleagues.

One thing I noticed is that the exhaustiveness warnings still seem to show in some editors like vscode and Rider. Building the project or viewing the file with Visual Studio 2022 suppresses the warnings as expected.

It seems like it's just broken for both of them:

• Rider: Roslyn: DiagnosticSuppressor Not Working in Rider 2020.2.1
• vscode: OmniSharp/omnisharp-roslyn#1711

Just thought I would note it here, as it may spare someone that extra effort to google this issue. Feel free to close this if you think it doesn't belong here! :)